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Thread: frustration over PH

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    frustration over PH

    Could someone please tell me how to keep the PH level more constant It seems like I need to add a quart of acid about every two or three days to keep the PH down. It should be @ about 7.6 right? Just did test with TF100 test kit

    FC 2.5
    CC .5
    PH 7.8 (just put a quart in yesterday)
    TA 100
    CH 500 (or more, solution never turned blue- purple) Pool has some scale
    CYA 45
    15000 ga irregular shape pool with spa
    pantair intelliflo 4speed variable pump
    pentair ic 40 swg
    pentair quad de filter

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    duraleigh's Avatar
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    Re: frustration over PH

    Because you have an SWG, rising pH is a very common issue. The chemist gurus on this forum recommend you lower your TA to about 70ppm instead of 100. That should help lower your acid consumption and help your pH remain more stable.

    Read how to lower TA in "Pool School"

    Your calcium is troublesome. After you work on your pH and get it resolved, you should probably look at your options (there aren't many) to reduce your CH down to about 200-300
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    JasonLion's Avatar
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    Re: frustration over PH

    First, if your plaster is less than one year old, the rising PH is simply something you need to put up with until the plaster gets a little older.

    Second, you should be able to dramatically reduce the amount of PH drift from sources other than fresh plaster by reducing your TA level. I would try reducing TA to around 60 and see how much that improves things.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    frustratedpoolmom's Avatar
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    Re: frustration over PH

    Here's what Waterbear says about the tricky and complex CH test:

    Quote Originally Posted by waterbear
    add the first reagent, swirl for 20-30 seconds. add the indicator (second reagent) and swirl to mix well. add the titrant one drop at a time and swirl for 20-30 seconds between drops.

    If you get a purple endpoint or 'floaties' in the sample add 6 drops of reagent 3 (the titrant) FIRST and swirl to mix then proceed with the procedure above. Be sure to include the first 6 drops you added in the final count of drops.
    I'd recommend you give it a try.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Guest

    Re: frustration over PH

    Three things I would suggest are dropping your TA to about 60 ppm,especially since your CH is so high (assuming your plaster is over a year old), bringing your CYA up to about 75-80 ppm, and adding borates to 50 ppm.
    The following theads should help explain why you pH is rising and how to minimize it. Your TA and CYA levels are key factors with a SWG!

    water-balance-tips-for-a-swg-t3663.html
    so-you-want-to-add-borates-to-your-pool-why-and-how-t4921.html
    how-to-lower-ta-t5341.html

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    frustratedpoolmom's Avatar
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    Re: frustration over PH

    Quote Originally Posted by waterbear
    Three things I would suggest are dropping your pH to about 60 ppm,especially since your CH is so high (assuming your plaster is over a year old), bringing your CYA up to about 75-80 ppm, and adding borates to 50 ppm.
    The following theads should help explain why you pH is rising and how to minimize it. Your TA and CYA levels are key factors with a SWG!

    water-balance-tips-for-a-swg-t3663.html
    so-you-want-to-add-borates-to-your-pool-why-and-how-t4921.html
    how-to-lower-ta-t5341.html
    Pretty sure Evan means drop your TA.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Guest

    Re: frustration over PH

    Yep, I did. That's what I get for ansering posts when I get in from work late at night!

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